Whichever troop contingencies faught in the turkish wars would be able to get their hands on bounty guns. One of the main engagements was of course Vienna, but it is not clear if a lot if these turkish guns were not still matchlocks. With the transition between wheelocks and flintlocks happening between 1690 and 1710 mostly. Transition happenend because of cheaper flintlock production. If the gun would be a matchlock, you would not use it, but would try to sell it. The only valuable part is the barrel, while the other parts would be scrap metal.